Why Does It Fail?

Camshaft position sensors operate in demanding engine environments and can fail for a number of reasons, including:

• Wiring and connector faults caused by damaged cables, poor connections or corrosion.
• Internal electronic deterioration resulting from prolonged exposure to heat and vibration.
• Contamination from oil, dirt or moisture affecting sensor performance.
• Mechanical damage to the sensor tip or reluctor wheel, causing inaccurate signal generation.
• Excessive engine vibration placing additional stress on the sensor and its internal components.
• Water ingress leading to corrosion and intermittent signal faults.

What Are the Symptoms?

When a camshaft position sensor fails or provides inaccurate data, common symptoms may include:

• Illuminated Engine Management Light (MIL) accompanied by diagnostic fault codes.
• Hard starting or extended cranking before the engine starts.
• Engine stalling or rough idle caused by incorrect timing information.
• Reduced engine performance including hesitation and poor acceleration.
• Increased fuel consumption due to inaccurate fuel injection and ignition timing.
• Engine entering limp-home mode if camshaft and crankshaft signals cannot be synchronised correctly.

Fitting Tips

• Inspect wiring and connectors for corrosion, damage or poor connections before replacing the sensor.
• Check the reluctor wheel and sensor alignment as damaged or misaligned components can produce symptoms similar to sensor failure.
• Handle the sensor carefully to avoid damage to the sensing element or housing during installation.
• Verify the correct air gap where applicable, following the vehicle manufacturer's specifications.
• Clear stored fault codes and carry out any required relearn procedures after installation.
• Validate the repair using live diagnostic data or an oscilloscope to confirm a stable and accurate signal.